Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff59d8d9ed701762…

MALICIOUS

PDF

62.7 KB Created: 2021-06-04 09:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a60f2e18930afe09d2c3e76660240de SHA-1: abf411c6911ff70dfff2df56b2a16b17bbbd1d15 SHA-256: ff59d8d9ed701762940f923b2b51861bb7ba61f9fddaf5ceb8d1933670e53602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8574

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f171c51e41fc7ab23ab57031aa2a094b/74432503232.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/gfg0leg24plm86qn1273pstt16/42062556880.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/s7loj83npnu74uv66vbrq9607o/zobegopidim.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089faae26a96---lokomonowilot.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608396296b621---19356380703.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088324032390---93757454173.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a51ae2f1516cce21becb3873c5ec7787/pizexefonefirolajob.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084481086d61---mefipu.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160722bbae8c3d---wasadusozuzowunufojapexi.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e3884ec4ed1e8f3fbcb581a0adbf8a9b/reseputurevavevaluturur.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcb41c6db---44114442334.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/xadujosoveduwogal.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb53303a5---92338966549.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb2ce5a13---93061602279.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf7b43021---solax.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160733197ce141---miwip.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6dce3454---siweminigatiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=7+laws+of+spiritual+success+selwyn+hughes
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde3.bin
dceecac74c2dc1d97029b51c870ce4112e1fc3b5a2da9c169abd5521d9f4b63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 5456 bytes

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